Ever since I came across
ZeroMQ, I've been toying with the idea of creating a Chat Server (possibly to be included in some kind of in game chat system) with it. It's basically a Socket Library but it has bindings for all the main programming languages and scripting languages (C,C++, Python and also web-based languages such as PHP). The beauty of this would be that if you created a non-browser based MMO you could theoretically create a PM System (or even a chat system) that's available inside and outside of the game. I'm sure there are other ways, but since this library has all the out-of-the-box support for multiple platforms I thought it'd be interesting to point out.
Currently I have created a small independent Client/Server system in Python but I believe there are greater possibilites with this.
It has a lot more uses, you could send streams of data through it in-game but lets keep things simple for now
Just thought i'd point it out
Jordan
PHP/Python (amongst other things) Person - Big Fan of MVC Architecture. Love CakePHP and CodeIgniter.